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(python2.1-lib.info)__main__

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Top-level script environment
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The environment where the top-level script is run.

This module represents the (otherwise anonymous) scope in which the
interpreter's main program executes -- commands read either from
standard input, from a script file, or from an interactive prompt.  It
is this environment in which the idiomatic "conditional script" stanza
causes a script to run:

     if __name__ == "__main__":
         main()